On 15.8.2012, at 23.01, 3.listas@adminlinux.com.br wrote:

I have a "ubuntu10.04 + ext4-filesystem + dovecot-2.0.13 +mdbox" configuration in my server. It works fine with ~50k accounts. Recently happened a filesystem corruption in a device of StMailLocation and I fix with fsck.ext4. After this crash, one account began to show access timeout and errors like this on force-resync:

# doveadm force-resync -u account INBOX doveadm(account): Warning: mdbox /path-to-mdbox/storage: rebuilding indexes doveadm(account): Error: Corrupted dbox file /path-to-mdbox/storage/m.83 (around offset=16): EOF reading msg header (got 0/30 bytes) doveadm(account): Warning: dbox: Copy of the broken file saved to /path-to-mdbox/storage/m.83.broken doveadm(account): Error: Corrupted dbox file /path-to-mdbox/storage/m.83 (around offset=16): EOF reading msg header (got 0/30 bytes) doveadm(account): Error: mdbox rebuild: Failed to fix file /path-to-mdbox/storage/m.83 doveadm(account): Error: Corrupted dbox file /path-to-mdbox/storage/m.92 (around offset=7): Invalid dbox version ...

Should I worry about the m.X.broken files ? How I fix these broken mdboxes ?

Dovecot fixed the mdbox files automatically and wrote m.*.broken files that contain the originals, just in case the fixing didn't do something correctly so you could manually look at them.

Now, if doveadm force-resync keeps finding errors all the time it's a bug. I'd first try the latest v2.1 though, may be fixed already.